"Projections of Education Statistics to 2021" is the 40th report in a series begun in 1964. It includes statistics on elementary and secondary schools and postsecondary degree-granting institutions. This report provides revisions of projections shown in "Projections of Education Statistics to 2020" and projections of enrollment, graduates, teachers, and expenditures to the year 2021. In addition to projections at the national level, the report includes projections of public elementary and secondary school enrollment and public high school graduates to the year 2021 at the state level. The projections in this report were produced by the National Center for Education Statistics (NCES) to provide researchers, policy analysts, and others with state-level projections developed using a consistent methodology. They are not intended to supplant detailed projections prepared for individual states. Assumptions regarding the population and the economy are the key factors underlying the projections of education statistics. NCES projections do not reflect changes in national, state, or local education policies that may affect education statistics. Appended are: (1) Introduction to Projection Methodology; (2) Supplementary Tables; (3) Data Sources; (4) References; (5) List of Abbreviations; and (6) Glossary. (Contains 77 tables, 27 figures and 1 footnote.) [For "Projections of Education Statistics to 2020. Thirty-Ninth Edition. NCES 2011-026," see ED524098.]